3[X+7]=12

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Solution for 3[X+7]=12 equation: 


Simplifying
3[X + 7] = 12

Reorder the terms:
3[7 + X] = 12
[7 * 3 + X * 3] = 12
[21 + 3X] = 12

Solving
21 + 3X = 12

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '-21' to each side of the equation.
21 + -21 + 3X = 12 + -21

Combine like terms: 21 + -21 = 0
0 + 3X = 12 + -21
3X = 12 + -21

Combine like terms: 12 + -21 = -9
3X = -9

Divide each side by '3'.
X = -3

Simplifying
X = -3

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